I have experience with the company and partially the product;
In my experience Scott at SACC restorations sells quality products that he has tested for fit and function and stands behind with great customer service.
I purchased a very early version of the CNC Performance ZF cable shifter adapter prior to SACC carrying the product. It was well made and functioned as designed to.
I chose to use an in cab shifter assembly from a Toyota Tercel, which is visually the same as Superformance uses (and very similar to the CNC unit), the Superformance unit mounted in a custom steel cable mount. If you are able to fabricate the Toyota unit is a cheap alternative, I got several from my local Pick & Pull at the time for $50 and passed them on here.
Input from anyone who has changed from stock Superformance to one of the SACC units would be testament to the CNC unit over the Toyota.